// SPDX-License-Identifier: GPL-2.0+ /* * PCI Express PCI Hot Plug Driver * * Copyright (C) 1995,2001 Compaq Computer Corporation * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) * Copyright (C) 2001 IBM Corp. * Copyright (C) 2003-2004 Intel Corporation * * All rights reserved. * * Send feedback to , */ #define dev_fmt(fmt) "pciehp: " fmt #include #include #include #include #include #include #include #include #include #include "../pci.h" #include "pciehp.h" static const struct dmi_system_id inband_presence_disabled_dmi_table[] = { /* * Match all Dell systems, as some Dell systems have inband * presence disabled on NVMe slots (but don't support the bit to * report it). Setting inband presence disabled should have no * negative effect, except on broken hotplug slots that never * assert presence detect--and those will still work, they will * just have a bit of extra delay before being probed. */ { .ident = "Dell System", .matches = { DMI_MATCH(DMI_OEM_STRING, "Dell System"), }, }, {} }; static inline struct pci_dev *ctrl_dev(struct controller *ctrl) { return ctrl->pcie->port; } static irqreturn_t pciehp_isr(int irq, void *dev_id); static irqreturn_t pciehp_ist(int irq, void *dev_id); static int pciehp_poll(void *data); static inline int pciehp_request_irq(struct controller *ctrl) { int retval, irq = ctrl->pcie->irq; if (pciehp_poll_mode) { ctrl->poll_thread = kthread_run(&pciehp_poll, ctrl, "pciehp_poll-%s", slot_name(ctrl)); return PTR_ERR_OR_ZERO(ctrl->poll_thread); } /* Installs the interrupt handler */ retval = request_threaded_irq(irq, pciehp_isr, pciehp_ist, IRQF_SHARED, "pciehp", ctrl); if (retval) ctrl_err(ctrl, "Cannot get irq %d for the hotplug controller\n", irq); return retval; } static inline void pciehp_free_irq(struct controller *ctrl) { if (pciehp_poll_mode) kthread_stop(ctrl->poll_thread); else free_irq(ctrl->pcie->irq, ctrl); } static int pcie_poll_cmd(struct controller *ctrl, int timeout) { struct pci_dev *pdev = ctrl_dev(ctrl); u16 slot_status; do { pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status); if (slot_status == (u16) ~0) { ctrl_info(ctrl, "%s: no response from device\n", __func__); return 0; } if (slot_status & PCI_EXP_SLTSTA_CC) { pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, PCI_EXP_SLTSTA_CC); return 1; } msleep(10); timeout -= 10; } while (timeout >= 0); return 0; /* timeout */ } static void pcie_wait_cmd(struct controller *ctrl) { unsigned int msecs = pciehp_poll_mode ? 2500 : 1000; unsigned long duration = msecs_to_jiffies(msecs); unsigned long cmd_timeout = ctrl->cmd_started + duration; unsigned long now, timeout; int rc; /* * If the controller does not generate notifications for command * completions, we never need to wait between writes. */ if (NO_CMD_CMPL(ctrl)) return; if (!ctrl->cmd_busy) return; /* * Even if the command has already timed out, we want to call * pcie_poll_cmd() so it can clear PCI_EXP_SLTSTA_CC. */ now = jiffies; if (time_before_eq(cmd_timeout, now)) timeout = 1; else timeout = cmd_timeout - now; if (ctrl->slot_ctrl & PCI_EXP_SLTCTL_HPIE && ctrl->slot_ctrl & PCI_EXP_SLTCTL_CCIE) rc = wait_event_timeout(ctrl->queue, !ctrl->cmd_busy, timeout); else rc = pcie_poll_cmd(ctrl, jiffies_to_msecs(timeout)); if (!rc) ctrl_info(ctrl, "Timeout on hotplug command %#06x (issued %u msec ago)\n", ctrl->slot_ctrl, jiffies_to_msecs(jiffies - ctrl->cmd_started)); } #define CC_ERRATUM_MASK (PCI_EXP_SLTCTL_PCC | \ PCI_EXP_SLTCTL_PIC | \ PCI_EXP_SLTCTL_AIC | \ PCI_EXP_SLTCTL_EIC) static void pcie_do_write_cmd(struct controller *ctrl, u16 cmd, u16 mask, bool wait) { struct pci_dev *pdev = ctrl_dev(ctrl); u16 slot_ctrl_orig, slot_ctrl; mutex_lock(&ctrl->ctrl_lock); /* * Always wait for any previous command that might still be in progress */ pcie_wait_cmd(ctrl); pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &slot_ctrl); if (slot_ctrl == (u16) ~0) { ctrl_info(ctrl, "%s: no response from device\n", __func__); goto out; } slot_ctrl_orig = slot_ctrl; slot_ctrl &= ~mask; slot_ctrl |= (cmd & mask); ctrl->cmd_busy = 1; smp_mb(); ctrl->slot_ctrl = slot_ctrl; pcie_capability_write_word(pdev, PCI_EXP_SLTCTL, slot_ctrl); ctrl->cmd_started = jiffies; /* * Controllers with the Intel CF118 and similar errata advertise * Command Completed support, but they only set Command Completed * if we change the "Control" bits for power, power indicator, * attention indicator, or interlock. If we only change the * "Enable" bits, they never set the Command Completed bit. */ if (pdev->broken_cmd_compl && (slot_ctrl_orig & CC_ERRATUM_MASK) == (slot_ctrl & CC_ERRATUM_MASK)) ctrl->cmd_busy = 0; /* * Optionally wait for the hardware to be ready for a new command, * indicating completion of the above issued command. */ if (wait) pcie_wait_cmd(ctrl); out: mutex_unlock(&ctrl->ctrl_lock); } /** * pcie_write_cmd - Issue controller command * @ctrl: controller to which the command is issued * @cmd: command value written to slot control register * @mask: bitmask of slot control register to be modified */ static void pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask) { pcie_do_write_cmd(ctrl, cmd, mask, true); } /* Same as above without waiting for the hardware to latch */ static void pcie_write_cmd_nowait(struct controller *ctrl, u16 cmd, u16 mask) { pcie_do_write_cmd(ctrl, cmd, mask, false); } /** * pciehp_check_link_active() - Is the link active * @ctrl: PCIe hotplug controller * * Check whether the downstream link is currently active. Note it is * possible that the card is removed immediately after this so the * caller may need to take it into account. * * If the hotplug controller itself is not available anymore returns * %-ENODEV. */ int pciehp_check_link_active(struct controller *ctrl) { struct pci_dev *pdev = ctrl_dev(ctrl); u16 lnk_status; int ret; ret = pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status); if (ret == PCIBIOS_DEVICE_NOT_FOUND || lnk_status == (u16)~0) return -ENODEV; ret = !!(lnk_status & PCI_EXP_LNKSTA_DLLLA); ctrl_dbg(ctrl, "%s: lnk_status = %x\n", __func__, lnk_status); return ret; } static bool pci_bus_check_dev(struct pci_bus *bus, int devfn) { u32 l; int count = 0; int delay = 1000, step = 20; bool found = false; do { found = pci_bus_read_dev_vendor_id(bus, devfn, &l, 0); count++; if (found) break; msleep(step); delay -= step; } while (delay > 0); if (count > 1) pr_debug("pci %04x:%02x:%02x.%d id reading try %d times with interval %d ms to get %08x\n", pci_domain_nr(bus), bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn), count, step, l); return found; } static void pcie_wait_for_presence(struct pci_dev *pdev) { int timeout = 1250; u16 slot_status; do { pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status); if (slot_status & PCI_EXP_SLTSTA_PDS) return; msleep(10); timeout -= 10; } while (timeout > 0); } int pciehp_check_link_status(struct controller *ctrl) { struct pci_dev *pdev = ctrl_dev(ctrl); bool found; u16 lnk_status; if (!pcie_wait_for_link(pdev, true)) { ctrl_info(ctrl, "Slot(%s): No link\n", slot_name(ctrl)); return -1; } if (ctrl->inband_presence_disabled) pcie_wait_for_presence(pdev); found = pci_bus_check_dev(ctrl->pcie->port->subordinate, PCI_DEVFN(0, 0)); /* ignore link or presence changes up to this point */ if (found) atomic_and(~(PCI_EXP_SLTSTA_DLLSC | PCI_EXP_SLTSTA_PDC), &ctrl->pending_events); pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status); ctrl_dbg(ctrl, "%s: lnk_status = %x\n", __func__, lnk_status); if ((lnk_status & PCI_EXP_LNKSTA_LT) || !(lnk_status & PCI_EXP_LNKSTA_NLW)) { ctrl_info(ctrl, "Slot(%s): Cannot train link: status %#06x\n", slot_name(ctrl), lnk_status); return -1; } pcie_update_link_speed(ctrl->pcie->port->subordinate, lnk_status); if (!found) { ctrl_info(ctrl, "Slot(%s): No device found\n", slot_name(ctrl)); return -1; } return 0; } static int __pciehp_link_set(struct controller *ctrl, bool enable) { struct pci_dev *pdev = ctrl_dev(ctrl); u16 lnk_ctrl; pcie_capability_read_word(pdev, PCI_EXP_LNKCTL, &lnk_ctrl); if (enable) lnk_ctrl &= ~PCI_EXP_LNKCTL_LD; else lnk_ctrl |= PCI_EXP_LNKCTL_LD; pcie_capability_write_word(pdev, PCI_EXP_LNKCTL, lnk_ctrl); ctrl_dbg(ctrl, "%s: lnk_ctrl = %x\n", __func__, lnk_ctrl); return 0; } static int pciehp_link_enable(struct controller *ctrl) { return __pciehp_link_set(ctrl, true); } int pciehp_get_raw_indicator_status(struct hotplug_slot *hotplug_slot, u8 *status) { struct controller *ctrl = to_ctrl(hotplug_slot); struct pci_dev *pdev = ctrl_dev(ctrl); u16 slot_ctrl; pci_config_pm_runtime_get(pdev); pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &slot_ctrl); pci_config_pm_runtime_put(pdev); *status = (slot_ctrl & (PCI_EXP_SLTCTL_AIC | PCI_EXP_SLTCTL_PIC)) >> 6; return 0; } int pciehp_get_attention_status(struct hotplug_slot *hotplug_slot, u8 *status) { struct controller *ctrl = to_ctrl(hotplug_slot); struct pci_dev *pdev = ctrl_dev(ctrl); u16 slot_ctrl; pci_config_pm_runtime_get(pdev); pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &slot_ctrl); pci_config_pm_runtime_put(pdev); ctrl_dbg(ctrl, "%s: SLOTCTRL %x, value read %x\n", __func__, pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_ctrl); switch (slot_ctrl & PCI_EXP_SLTCTL_AIC) { case PCI_EXP_SLTCTL_ATTN_IND_ON: *status = 1; /* On */ break; case PCI_EXP_SLTCTL_ATTN_IND_BLINK: *status = 2; /* Blink */ break; case PCI_EXP_SLTCTL_ATTN_IND_OFF: *status = 0; /* Off */ break; default: *status = 0xFF; break; } return 0; } void pciehp_get_power_status(struct controller *ctrl, u8 *status) { struct pci_dev *pdev = ctrl_dev(ctrl); u16 slot_ctrl; pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &slot_ctrl); ctrl_dbg(ctrl, "%s: SLOTCTRL %x value read %x\n", __func__, pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_ctrl); switch (slot_ctrl & PCI_EXP_SLTCTL_PCC) { case PCI_EXP_SLTCTL_PWR_ON: *status = 1; /* On */ break; case PCI_EXP_SLTCTL_PWR_OFF: *status = 0; /* Off */ break; default: *status = 0xFF; break; } } void pciehp_get_latch_status(struct controller *ctrl, u8 *status) { struct pci_dev *pdev = ctrl_dev(ctrl); u16 slot_status; pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status); *status = !!(slot_status & PCI_EXP_SLTSTA_MRLSS); } /** * pciehp_card_present() - Is the card present * @ctrl: PCIe hotplug controller * * Function checks whether the card is currently present in the slot and * in that case returns true. Note it is possible that the card is * removed immediately after the check so the caller may need to take * this into account. * * It the hotplug controller itself is not available anymore returns * %-ENODEV. */ int pciehp_card_present(struct controller *ctrl) { struct pci_dev *pdev = ctrl_dev(ctrl); u16 slot_status; int ret; ret = pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status); if (ret == PCIBIOS_DEVICE_NOT_FOUND || slot_status == (u16)~0) return -ENODEV; return !!(slot_status & PCI_EXP_SLTSTA_PDS); } /** * pciehp_card_present_or_link_active() - whether given slot is occupied * @ctrl: PCIe hotplug controller * * Unlike pciehp_card_present(), which determines presence solely from the * Presence Detect State bit, this helper also returns true if the Link Active * bit is set. This is a concession to broken hotplug ports which hardwire * Presence Detect State to zero, such as Wilocity's [1ae9:0200]. * * Returns: %1 if the slot is occupied and %0 if it is not. If the hotplug * port is not present anymore returns %-ENODEV. */ int pciehp_card_present_or_link_active(struct controller *ctrl) { int ret; ret = pciehp_card_present(ctrl); if (ret) return ret; return pciehp_check_link_active(ctrl); } int pciehp_query_power_fault(struct controller *ctrl) { struct pci_dev *pdev = ctrl_dev(ctrl); u16 slot_status; pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status); return !!(slot_status & PCI_EXP_SLTSTA_PFD); } int pciehp_set_raw_indicator_status(struct hotplug_slot *hotplug_slot, u8 status) { struct controller *ctrl = to_ctrl(hotplug_slot); struct pci_dev *pdev = ctrl_dev(ctrl); pci_config_pm_runtime_get(pdev); pcie_write_cmd_nowait(ctrl, status << 6, PCI_EXP_SLTCTL_AIC | PCI_EXP_SLTCTL_PIC); pci_config_pm_runtime_put(pdev); return 0; } /** * pciehp_set_indicators() - set attention indicator, power indicator, or both * @ctrl: PCIe hotplug controller * @pwr: one of: * PCI_EXP_SLTCTL_PWR_IND_ON * PCI_EXP_SLTCTL_PWR_IND_BLINK * PCI_EXP_SLTCTL_PWR_IND_OFF * @attn: one of: * PCI_EXP_SLTCTL_ATTN_IND_ON * PCI_EXP_SLTCTL_ATTN_IND_BLINK * PCI_EXP_SLTCTL_ATTN_IND_OFF * * Either @pwr or @attn can also be INDICATOR_NOOP to leave that indicator * unchanged. */ void pciehp_set_indicators(struct controller *ctrl, int pwr, int attn) { u16 cmd = 0, mask = 0; if (PWR_LED(ctrl) && pwr != INDICATOR_NOOP) { cmd |= (pwr & PCI_EXP_SLTCTL_PIC); mask |= PCI_EXP_SLTCTL_PIC; } if (ATTN_LED(ctrl) && attn != INDICATOR_NOOP) { cmd |= (attn & PCI_EXP_SLTCTL_AIC); mask |= PCI_EXP_SLTCTL_AIC; } if (cmd) { pcie_write_cmd_nowait(ctrl, cmd, mask); ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, cmd); } } int pciehp_power_on_slot(struct controller *ctrl) { struct pci_dev *pdev = ctrl_dev(ctrl); u16 slot_status; int retval; /* Clear power-fault bit from previous power failures */ pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status); if (slot_status & PCI_EXP_SLTSTA_PFD) pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, PCI_EXP_SLTSTA_PFD); ctrl->power_fault_detected = 0; pcie_write_cmd(ctrl, PCI_EXP_SLTCTL_PWR_ON, PCI_EXP_SLTCTL_PCC); ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, PCI_EXP_SLTCTL_PWR_ON); retval = pciehp_link_enable(ctrl); if (retval) ctrl_err(ctrl, "%s: Can not enable the link!\n", __func__); return retval; } void pciehp_power_off_slot(struct controller *ctrl) { pcie_write_cmd(ctrl, PCI_EXP_SLTCTL_PWR_OFF, PCI_EXP_SLTCTL_PCC); ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, PCI_EXP_SLTCTL_PWR_OFF); } static void pciehp_ignore_dpc_link_change(struct controller *ctrl, struct pci_dev *pdev, int irq) { /* * Ignore link changes which occurred while waiting for DPC recovery. * Could be several if DPC triggered multiple times consecutively. */ synchronize_hardirq(irq); atomic_and(~PCI_EXP_SLTSTA_DLLSC, &ctrl->pending_events); if (pciehp_poll_mode) pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, PCI_EXP_SLTSTA_DLLSC); ctrl_info(ctrl, "Slot(%s): Link Down/Up ignored (recovered by DPC)\n", slot_name(ctrl)); /* * If the link is unexpectedly down after successful recovery, * the corresponding link change may have been ignored above. * Synthesize it to ensure that it is acted on. */ down_read(&ctrl->reset_lock); if (!pciehp_check_link_active(ctrl)) pciehp_request(ctrl, PCI_EXP_SLTSTA_DLLSC); up_read(&ctrl->reset_lock); } static irqreturn_t pciehp_isr(int irq, void *dev_id) { struct controller *ctrl = (struct controller *)dev_id; struct pci_dev *pdev = ctrl_dev(ctrl); struct device *parent = pdev->dev.parent; u16 status, events = 0; /* * Interrupts only occur in D3hot or shallower and only if enabled * in the Slot Control register (PCIe r4.0, sec 6.7.3.4). */ if (pdev->current_state == PCI_D3cold || (!(ctrl->slot_ctrl & PCI_EXP_SLTCTL_HPIE) && !pciehp_poll_mode)) return IRQ_NONE; /* * Keep the port accessible by holding a runtime PM ref on its parent. * Defer resume of the parent to the IRQ thread if it's suspended. * Mask the interrupt until then. */ if (parent) { pm_runtime_get_noresume(parent); if (!pm_runtime_active(parent)) { pm_runtime_put(parent); disable_irq_nosync(irq); atomic_or(RERUN_ISR, &ctrl->pending_events); return IRQ_WAKE_THREAD; } } read_status: pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &status); if (status == (u16) ~0) { ctrl_info(ctrl, "%s: no response from device\n", __func__); if (parent) pm_runtime_put(parent); return IRQ_NONE; } /* * Slot Status contains plain status bits as well as event * notification bits; right now we only want the event bits. */ status &= PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD | PCI_EXP_SLTSTA_PDC | PCI_EXP_SLTSTA_CC | PCI_EXP_SLTSTA_DLLSC; /* * If we've already reported a power fault, don't report it again * until we've done something to handle it. */ if (ctrl->power_fault_detected) status &= ~PCI_EXP_SLTSTA_PFD; events |= status; if (!events) { if (parent) pm_runtime_put(parent); return IRQ_NONE; } if (status) { pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, events); /* * In MSI mode, all event bits must be zero before the port * will send a new interrupt (PCIe Base Spec r5.0 sec 6.7.3.4). * So re-read the Slot Status register in case a bit was set * between read and write. */ if (pci_dev_msi_enabled(pdev) && !pciehp_poll_mode) goto read_status; } ctrl_dbg(ctrl, "pending interrupts %#06x from Slot Status\n", events); if (parent) pm_runtime_put(parent); /* * Command Completed notifications are not deferred to the * IRQ thread because it may be waiting for their arrival. */ if (events & PCI_EXP_SLTSTA_CC) { ctrl->cmd_busy = 0; smp_mb(); wake_up(&ctrl->queue); if (events == PCI_EXP_SLTSTA_CC) return IRQ_HANDLED; events &= ~PCI_EXP_SLTSTA_CC; } if (pdev->ignore_hotplug) { ctrl_dbg(ctrl, "ignoring hotplug event %#06x\n", events); return IRQ_HANDLED; } /* Save pending events for consumption by IRQ thread. */ atomic_or(events, &ctrl->pending_events); return IRQ_WAKE_THREAD; } static irqreturn_t pciehp_ist(int irq, void *dev_id) { struct controller *ctrl = (struct controller *)dev_id; struct pci_dev *pdev = ctrl_dev(ctrl); irqreturn_t ret; u32 events; ctrl->ist_running = true; pci_config_pm_runtime_get(pdev); /* rerun pciehp_isr() if the port was inaccessible on interrupt */ if (atomic_fetch_and(~RERUN_ISR, &ctrl->pending_events) & RERUN_ISR) { ret = pciehp_isr(irq, dev_id); enable_irq(irq); if (ret != IRQ_WAKE_THREAD) goto out; } synchronize_hardirq(irq); events = atomic_xchg(&ctrl->pending_events, 0); if (!events) { ret = IRQ_NONE; goto out; } /* Check Attention Button Pressed */ if (events & PCI_EXP_SLTSTA_ABP) { ctrl_info(ctrl, "Slot(%s): Attention button pressed\n", slot_name(ctrl)); pciehp_handle_button_press(ctrl); } /* Check Power Fault Detected */ if ((events & PCI_EXP_SLTSTA_PFD) && !ctrl->power_fault_detected) { ctrl->power_fault_detected = 1; ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(ctrl)); pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF, PCI_EXP_SLTCTL_ATTN_IND_ON); } /* * Ignore Link Down/Up events caused by Downstream Port Containment * if recovery from the error succeeded. */ if ((events & PCI_EXP_SLTSTA_DLLSC) && pci_dpc_recovered(pdev) && ctrl->state == ON_STATE) { events &= ~PCI_EXP_SLTSTA_DLLSC; pciehp_ignore_dpc_link_change(ctrl, pdev, irq); } /* * Disable requests have higher priority than Presence Detect Changed * or Data Link Layer State Changed events. */ down_read(&ctrl->reset_lock); if (events & DISABLE_SLOT) pciehp_handle_disable_request(ctrl); else if (events & (PCI_EXP_SLTSTA_PDC | PCI_EXP_SLTSTA_DLLSC)) pciehp_handle_presence_or_link_change(ctrl, events); up_read(&ctrl->reset_lock); ret = IRQ_HANDLED; out: pci_config_pm_runtime_put(pdev); ctrl->ist_running = false; wake_up(&ctrl->requester); return ret; } static int pciehp_poll(void *data) { struct controller *ctrl = data; schedule_timeout_idle(10 * HZ); /* start with 10 sec delay */ while (!kthread_should_stop()) { /* poll for interrupt events or user requests */ while (pciehp_isr(IRQ_NOTCONNECTED, ctrl) == IRQ_WAKE_THREAD || atomic_read(&ctrl->pending_events)) pciehp_ist(IRQ_NOTCONNECTED, ctrl); if (pciehp_poll_time <= 0 || pciehp_poll_time > 60) pciehp_poll_time = 2; /* clamp to sane value */ schedule_timeout_idle(pciehp_poll_time * HZ); } return 0; } static void pcie_enable_notification(struct controller *ctrl) { u16 cmd, mask; /* * TBD: Power fault detected software notification support. * * Power fault detected software notification is not enabled * now, because it caused power fault detected interrupt storm * on some machines. On those machines, power fault detected * bit in the slot status register was set again immediately * when it is cleared in the interrupt service routine, and * next power fault detected interrupt was notified again. */ /* * Always enable link events: thus link-up and link-down shall * always be treated as hotplug and unplug respectively. Enable * presence detect only if Attention Button is not present. */ cmd = PCI_EXP_SLTCTL_DLLSCE; if (ATTN_BUTTN(ctrl)) cmd |= PCI_EXP_SLTCTL_ABPE; else cmd |= PCI_EXP_SLTCTL_PDCE; if (!pciehp_poll_mode) cmd |= PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE; mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE | PCI_EXP_SLTCTL_PFDE | PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE | PCI_EXP_SLTCTL_DLLSCE); pcie_write_cmd_nowait(ctrl, cmd, mask); ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, cmd); } static void pcie_disable_notification(struct controller *ctrl) { u16 mask; mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE | PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE | PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE | PCI_EXP_SLTCTL_DLLSCE); pcie_write_cmd(ctrl, 0, mask); ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, 0); } void pcie_clear_hotplug_events(struct controller *ctrl) { pcie_capability_write_word(ctrl_dev(ctrl), PCI_EXP_SLTSTA, PCI_EXP_SLTSTA_PDC | PCI_EXP_SLTSTA_DLLSC); } void pcie_enable_interrupt(struct controller *ctrl) { u16 mask; mask = PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_DLLSCE; pcie_write_cmd(ctrl, mask, mask); } void pcie_disable_interrupt(struct controller *ctrl) { u16 mask; /* * Mask hot-plug interrupt to prevent it triggering immediately * when the link goes inactive (we still get PME when any of the * enabled events is detected). Same goes with Link Layer State * changed event which generates PME immediately when the link goes * inactive so mask it as well. */ mask = PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_DLLSCE; pcie_write_cmd(ctrl, 0, mask); } /* * pciehp has a 1:1 bus:slot relationship so we ultimately want a secondary * bus reset of the bridge, but at the same time we want to ensure that it is * not seen as a hot-unplug, followed by the hot-plug of the device. Thus, * disable link state notification and presence detection change notification * momentarily, if we see that they could interfere. Also, clear any spurious * events after. */ int pciehp_reset_slot(struct hotplug_slot *hotplug_slot, bool probe) { struct controller *ctrl = to_ctrl(hotplug_slot); struct pci_dev *pdev = ctrl_dev(ctrl); u16 stat_mask = 0, ctrl_mask = 0; int rc; if (probe) return 0; down_write(&ctrl->reset_lock); if (!ATTN_BUTTN(ctrl)) { ctrl_mask |= PCI_EXP_SLTCTL_PDCE; stat_mask |= PCI_EXP_SLTSTA_PDC; } ctrl_mask |= PCI_EXP_SLTCTL_DLLSCE; stat_mask |= PCI_EXP_SLTSTA_DLLSC; pcie_write_cmd(ctrl, 0, ctrl_mask); ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, 0); rc = pci_bridge_secondary_bus_reset(ctrl->pcie->port); pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, stat_mask); pcie_write_cmd_nowait(ctrl, ctrl_mask, ctrl_mask); ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, ctrl_mask); up_write(&ctrl->reset_lock); return rc; } int pcie_init_notification(struct controller *ctrl) { if (pciehp_request_irq(ctrl)) return -1; pcie_enable_notification(ctrl); ctrl->notification_enabled = 1; return 0; } void pcie_shutdown_notification(struct controller *ctrl) { if (ctrl->notification_enabled) { pcie_disable_notification(ctrl); pciehp_free_irq(ctrl); ctrl->notification_enabled = 0; } } static inline void dbg_ctrl(struct controller *ctrl) { struct pci_dev *pdev = ctrl->pcie->port; u16 reg16; ctrl_dbg(ctrl, "Slot Capabilities : 0x%08x\n", ctrl->slot_cap); pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, ®16); ctrl_dbg(ctrl, "Slot Status : 0x%04x\n", reg16); pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, ®16); ctrl_dbg(ctrl, "Slot Control : 0x%04x\n", reg16); } #define FLAG(x, y) (((x) & (y)) ? '+' : '-') struct controller *pcie_init(struct pcie_device *dev) { struct controller *ctrl; u32 slot_cap, slot_cap2, link_cap; u8 poweron; struct pci_dev *pdev = dev->port; struct pci_bus *subordinate = pdev->subordinate; ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); if (!ctrl) return NULL; ctrl->pcie = dev; pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, &slot_cap); if (pdev->hotplug_user_indicators) slot_cap &= ~(PCI_EXP_SLTCAP_AIP | PCI_EXP_SLTCAP_PIP); /* * We assume no Thunderbolt controllers support Command Complete events, * but some controllers falsely claim they do. */ if (pdev->is_thunderbolt) slot_cap |= PCI_EXP_SLTCAP_NCCS; ctrl->slot_cap = slot_cap; mutex_init(&ctrl->ctrl_lock); mutex_init(&ctrl->state_lock); init_rwsem(&ctrl->reset_lock); init_waitqueue_head(&ctrl->requester); init_waitqueue_head(&ctrl->queue); INIT_DELAYED_WORK(&ctrl->button_work, pciehp_queue_pushbutton_work); dbg_ctrl(ctrl); down_read(&pci_bus_sem); ctrl->state = list_empty(&subordinate->devices) ? OFF_STATE : ON_STATE; up_read(&pci_bus_sem); pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP2, &slot_cap2); if (slot_cap2 & PCI_EXP_SLTCAP2_IBPD) { pcie_write_cmd_nowait(ctrl, PCI_EXP_SLTCTL_IBPD_DISABLE, PCI_EXP_SLTCTL_IBPD_DISABLE); ctrl->inband_presence_disabled = 1; } if (dmi_first_match(inband_presence_disabled_dmi_table)) ctrl->inband_presence_disabled = 1; /* Check if Data Link Layer Link Active Reporting is implemented */ pcie_capability_read_dword(pdev, PCI_EXP_LNKCAP, &link_cap); /* Clear all remaining event bits in Slot Status register. */ pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD | PCI_EXP_SLTSTA_MRLSC | PCI_EXP_SLTSTA_CC | PCI_EXP_SLTSTA_DLLSC | PCI_EXP_SLTSTA_PDC); ctrl_info(ctrl, "Slot #%d AttnBtn%c PwrCtrl%c MRL%c AttnInd%c PwrInd%c HotPlug%c Surprise%c Interlock%c NoCompl%c IbPresDis%c LLActRep%c%s\n", (slot_cap & PCI_EXP_SLTCAP_PSN) >> 19, FLAG(slot_cap, PCI_EXP_SLTCAP_ABP), FLAG(slot_cap, PCI_EXP_SLTCAP_PCP), FLAG(slot_cap, PCI_EXP_SLTCAP_MRLSP), FLAG(slot_cap, PCI_EXP_SLTCAP_AIP), FLAG(slot_cap, PCI_EXP_SLTCAP_PIP), FLAG(slot_cap, PCI_EXP_SLTCAP_HPC), FLAG(slot_cap, PCI_EXP_SLTCAP_HPS), FLAG(slot_cap, PCI_EXP_SLTCAP_EIP), FLAG(slot_cap, PCI_EXP_SLTCAP_NCCS), FLAG(slot_cap2, PCI_EXP_SLTCAP2_IBPD), FLAG(link_cap, PCI_EXP_LNKCAP_DLLLARC), pdev->broken_cmd_compl ? " (with Cmd Compl erratum)" : ""); /* * If empty slot's power status is on, turn power off. The IRQ isn't * requested yet, so avoid triggering a notification with this command. */ if (POWER_CTRL(ctrl)) { pciehp_get_power_status(ctrl, &poweron); if (!pciehp_card_present_or_link_active(ctrl) && poweron) { pcie_disable_notification(ctrl); pciehp_power_off_slot(ctrl); } } return ctrl; } void pciehp_release_ctrl(struct controller *ctrl) { cancel_delayed_work_sync(&ctrl->button_work); kfree(ctrl); } static void quirk_cmd_compl(struct pci_dev *pdev) { u32 slot_cap; if (pci_is_pcie(pdev)) { pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, &slot_cap); if (slot_cap & PCI_EXP_SLTCAP_HPC && !(slot_cap & PCI_EXP_SLTCAP_NCCS)) pdev->broken_cmd_compl = 1; } } DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, PCI_CLASS_BRIDGE_PCI, 8, quirk_cmd_compl); DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_QCOM, 0x0400, PCI_CLASS_BRIDGE_PCI, 8, quirk_cmd_compl); DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_QCOM, 0x0401, PCI_CLASS_BRIDGE_PCI, 8, quirk_cmd_compl); DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_HXT, 0x0401, PCI_CLASS_BRIDGE_PCI, 8, quirk_cmd_compl);